CARTO® 3 System and Real Time Intracardiac Ultrasound

Inclusion Criteria: * Drug refractory, recurrent symptomatic paroxysmal AF * Age 18 years or older * Patients able and willing to provide written informed consent to participate in the study and comply with study requirements Exclusion Criteria: * Atrial fibrillation secondary to electrolyte imbalance, thyroid disease, or reversible or non-cardiac cause * Previous ablation for atrial fibrillation * AF episodes that last longer than 30 days * Uncontrolled heart failure, or NYHA Class III or IV heart failure * Documented intra-atrial thrombus or other abnormality on pre-ablation imaging * Contraindication to anticoagulation * Stroke, cardiac surgery, unstable angina, myocardial infarction or percutaneous coronary intervention within the past 3 months * Awaiting cardiac transplantation * Heart disease for which corrective surgery is anticipated within 6 months * Enrollment in other investigational drug or device study * Subjects unwilling to comply with protocol or follow-up requirements * Patients who are pregnant